Localization of the Aortic Valve by Intracavitary Electrocardiography

Abstract

The intracavitary electrocardiogram was studied in the aortic outflow tract during left heart catheterization to determine its usefulness in accurately locating the aortic valve. Twenty-eight of 31 cases studied showed a significant electrocardiographic change at the valve which was not observed elsewhere. Changes noted included decrease in QRS voltage, qualitative QRS change, and P-wave change. The routine use of the intracardiac electrocardiogram in conjunction with other technics is advocated.